scsi: core: Retry unaligned zoned writes

If zoned writes (REQ_OP_WRITE) for a sequential write required zone have
a starting LBA that differs from the write pointer, e.g. because a prior
write triggered a unit attention condition, then the storage device will
respond with an UNALIGNED WRITE COMMAND error. Retry commands that failed
with an unaligned write error.

Reviewed-by: Damien Le Moal <[email protected]>
Cc: Martin K. Petersen <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Ming Lei <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>

Author: bvanassche

drivers/scsi/scsi_error.c

@@ -713,6 +713,22 @@ enum scsi_disposition scsi_check_sense(struct scsi_cmnd *scmd)
 		fallthrough;
 
 	case ILLEGAL_REQUEST:
+		/*
+		 * Unaligned write command. This may indicate that zoned writes
+		 * have been received by the device in the wrong order. If write
+		 * pipelining is enabled, retry.
+		 */
+		if (sshdr.asc == 0x21 && sshdr.ascq == 0x04 &&
+		    req->q->limits.driver_preserves_write_order &&
+		    blk_rq_is_seq_zoned_write(req) &&
+		    scsi_cmd_retry_allowed(scmd)) {
+			SCSI_LOG_ERROR_RECOVERY(1,
+				sdev_printk(KERN_WARNING, scmd->device,
+				"Retrying unaligned write at LBA %#llx.\n",
+				scsi_get_lba(scmd)));
+			return NEEDS_RETRY;
+		}
+
 		if (sshdr.asc == 0x20 || /* Invalid command operation code */
 		    sshdr.asc == 0x21 || /* Logical block address out of range */
 		    sshdr.asc == 0x22 || /* Invalid function */